Backing up only apps and app-data.
While preparing for the upgrade from macOS High Sierra to macOS Mojave, I was backing up my data and realised that I already have a back up of my files and songs. So, if I simply copy my apps from the Applications folder and paste into my backup disk and when I finally upgrade to macOS Mojave can I copy them back into the Applications folder? I am worried because I use Xcode and not sure how my developer certificates will be transferred during the transition.
MacBook Pro (13-inch, 2018, 4 TBT3), macOS High Sierra (10.13.6)